Hot Blast HB1520 Wood Furnace

Hot Blast HB1520 Wood Furnace

The Hot Blast HB1520 by US Stove is a wood burning furnace designed to use in conjunction with your existing HVAC ductwork. With twin 500 CFM blowers and up to 180,000 BTUs, it is designed to heat a home up to 3,500 Sq. Ft. Its heavy duty cast-iron door with a glass viewing front gives out the ambience of a flame without compromising efficiency. The open plenum allows for easy installation and with a built in ash-pan and firebrick line combustion chamber, the HB1520 is a great option for heating larger spaces in the furnace category. The Hot Blast HB1520 EPA certified furnace exceeds 75% efficiency and qualifies for the 30% IRS 25C Residential Energy Tax Credit.

  • Model #: HB1520

  • Features
    • Heavy Duty cast-iron door with viewing window
    • Heats up to 3,500 Sq Ft of living space with 180,000 BTUs
    • EPA Certified & 75% Efficiency Rating
    • Accepts logs up to 23" and easy to load
    • Qualifies for IRS 30% 25C Residential Energy Tax Credit
    • Firebrick lined to boost efficiency and heating capacity
    • Built in ash pan for easy clean up
    • Recommended installation by NFI Certified Installer (USA) or WETT Certified Installer (Canada)
    • Dual blowers provide maximum heat output
  • Specifications
    Product EPA Approved Yes
    Product Cooktop No
    Product Vent Location Rear
    Product Removable Water Reservoir No
    Product ETL Listed Yes
    Product Temperature Gauge No
    Product Venting Required Yes
    Product Heating Area (ft²) 3500
    Product Stove Type Freestanding
    Product Manufacturer Warranty 5 Year Firebox and Grates Limited Warranty, 1 Year Electrical Limited Warranty
    Product CSA Certified Yes
    Product Vented Or Vent-Free Vented
    Product Firebox Width (in) 20
    Product Brick-Lined Firebox Yes
    Product Vent Diameter (in) 6
    Product Pedestal Base Included No
    Product Firebox Height (in) 19.5
    Product Air Wash System No
    Product Outside Air Kit No
    Product Heater Type Outlet
    Product Package Contents Furnace, filter box, Honeywell, Draft and distribution blowers
    Product Ash Drawer Yes
    Product Blower Yes
    Product Catalytic/Non Catalytic Non Catalytic
    Product UL Listed No
    Product Auto Ignition No
    Product Maximum BTU 180,000
  • Dimensions
    Assembled Width (in) 23.375
    Package Weight 585
    Package Width 27.5
    Package Height 50
    Assembled Depth (in) 54.75
    Package Depth 36.5
    Assembled Height (in) 45
  • Other
    MFG Brand Name US Stove Company
    Does this Product Have a Warranty? Yes
    MFG Model # (Series) HB1520
    Manufacturer Warranty Limited Lifetime firebox warranty, 1 Year all other parts, 1 year Electrical parts
    Warranty Type Limited - Parts
    Search Keywords Furnace, fireplace, coal, whole house, heater, hearth
    Warranty Type of Effective Date Purchase Date
    UPC 012685015200
  • Regulatory
    California Proposition 65 Warning Required Yes
    California Prop 65 Warning Label (Text) This product can expose you to chemicals including carbon monoxide, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
    Contains Chemicals that Cause Cancer (Calif Prop65) Yes
    Item has Restrictions? Yes
    List the Chemicals contained that cause Cancer per California Proposition 65 Carbon Monoxide
  • FAQs
    • What is a draft induction kit?
      • Draft Induction Kits are optional accessories that are available to help a furnace burn coal more efficiently. They can be used when burning wood only, but are usually not necessary and can cause over-heating if the flue and intake dampers are not adjusted properly.
      • Draft kits work by forcing air into the firebox using a draft induction blower.
      • This draft blower is controlled by an external wall thermostat.
      • When the thermostat is calling for heat the draft blower will turn on to stoke the fire.
      • This causes the temperature inside the firebox to rise.
      • Once temperatures are up above about 150°F (factory ON setting for Honeywell Limit Control) the distribution blowers will turn on and circulate heat through the supply duct line.
      • When the thermostat’s set temperature is met the draft blower will turn off.
      • The temperatures inside the firebox will lower and the Honeywell Limit Control will turn the distribution blowers off at about 100°F (factory OFF setting for the Honeywell Limit Control).
      • This cycle continues for the life of the fire.
    • What happens if I don't have an air return?
      • Furnace could be unable to push enough hot air through the heating ducts.
      • The fuel will not combust properly.
      • Furnace or furnace components can overheat.
      • Chimney will not draft correctly.
    • Do I need to install a return air supply?
      • Return air can be provided by installing a separate duct system or by tying into the cold air return of an existing gas or oil furnace.
      • The cold air return duct can be connected to the furnace with either a factory manufactured USSC filter box or an equivalent fabricated from sheet metal.
      • When installing a cold air return, the minimum size shall be a 16” x 20” or equivalent (320 sq. in.) in order to insure proper furnace performance.
      • A filter should be installed in the cold air return. Furnace filters should be checked and cleaned/replaced regularly.
      • If return air is not provided, the warm air distributed into the home will be restricted and the efficiency of the furnace is decreased.
      • Without a return air system, warm air will be drawn into your basement, unnecessarily heating unused areas of the home.
      • In extreme cases, if the room in which the furnace is located is fairly airtight, the blowers on the furnace could depressurize the room and pull toxic flue gases from the furnace. The fumes could then be distributed throughout the home.
      • Air registers allow the furnace to bring in air to help circulate the heat that is created by the furnace.
      • These registers are normally located low to the ground in different areas around the home in order to capture the colder air that sinks to the floor.
      • Once inside the air return duct, the colder air is pulls through the ductwork back to the furnace where it is filtered, heated and sent back through the supply air vents.
      • An installation that does not include a return air duct will not be able to circulate heat throughout a home.
      • Also, with no return air duct system, a negative air pressure situation is created and will lower the amount of available combustible air. This can affect the draft in the chimney and cause smoke spillage.
    • What are the installation requirements of a furnace?
      • It is recommended that there be at least 20ft of vertical chimney length.
      • The size of the flue needs to be the same size throughout the entire length of the installation.
      • No more than 180° in elbows. (This restricts draft)
      • For every 1ft of horizontal length there needs to be a ¼” rise.
      • Termination must include a UL approved rain cap.
      • All venting must be made by the same manufacturer.
        • Small variations between pipe manufacturers can lower efficiency of the chimney and pose a safety hazard!
      • After roof penetration: 3-2-10 rule must be followed.
        • There must be a minimum of 3 ft of piping past the point of penetration.
        • The termination must be 2 ft above anything within a 10 ft radius.
    • My furnace is able to burn coal. What types of coal should I use?
      Anthracite Coal (an-thruh-sight)
      • Harder coal that burns cleaner.
      • Much more difficult to use.
      • Not as available and much more expensive
      • SIZE: egg or broken egg (2 5/16” up to 4 3/8” in diameter).
      Bituminous Coal (bi-toom-uh-nus)
      • Softer coal that burns dirtier.
      • Requires more cleaning because more soot will collect on heating surfaces and pipes.
      • SIZE: large nut to small egg (1 3/4” to 4” Diameter).
Document File Type File Size Product
HB1520 Owners Manual application/pdf 10 MB Download️
HB1520 Warranty application/pdf 157 KB Download️
  • What is a draft induction kit?
    • Draft Induction Kits are optional accessories that are available to help a furnace burn coal more efficiently. They can be used when burning wood only, but are usually not necessary and can cause over-heating if the flue and intake dampers are not adjusted properly.
    • Draft kits work by forcing air into the firebox using a draft induction blower.
    • This draft blower is controlled by an external wall thermostat.
    • When the thermostat is calling for heat the draft blower will turn on to stoke the fire.
    • This causes the temperature inside the firebox to rise.
    • Once temperatures are up above about 150°F (factory ON setting for Honeywell Limit Control) the distribution blowers will turn on and circulate heat through the supply duct line.
    • When the thermostat’s set temperature is met the draft blower will turn off.
    • The temperatures inside the firebox will lower and the Honeywell Limit Control will turn the distribution blowers off at about 100°F (factory OFF setting for the Honeywell Limit Control).
    • This cycle continues for the life of the fire.
  • What happens if I don't have an air return?
    • Furnace could be unable to push enough hot air through the heating ducts.
    • The fuel will not combust properly.
    • Furnace or furnace components can overheat.
    • Chimney will not draft correctly.
  • Do I need to install a return air supply?
    • Return air can be provided by installing a separate duct system or by tying into the cold air return of an existing gas or oil furnace.
    • The cold air return duct can be connected to the furnace with either a factory manufactured USSC filter box or an equivalent fabricated from sheet metal.
    • When installing a cold air return, the minimum size shall be a 16” x 20” or equivalent (320 sq. in.) in order to insure proper furnace performance.
    • A filter should be installed in the cold air return. Furnace filters should be checked and cleaned/replaced regularly.
    • If return air is not provided, the warm air distributed into the home will be restricted and the efficiency of the furnace is decreased.
    • Without a return air system, warm air will be drawn into your basement, unnecessarily heating unused areas of the home.
    • In extreme cases, if the room in which the furnace is located is fairly airtight, the blowers on the furnace could depressurize the room and pull toxic flue gases from the furnace. The fumes could then be distributed throughout the home.
    • Air registers allow the furnace to bring in air to help circulate the heat that is created by the furnace.
    • These registers are normally located low to the ground in different areas around the home in order to capture the colder air that sinks to the floor.
    • Once inside the air return duct, the colder air is pulls through the ductwork back to the furnace where it is filtered, heated and sent back through the supply air vents.
    • An installation that does not include a return air duct will not be able to circulate heat throughout a home.
    • Also, with no return air duct system, a negative air pressure situation is created and will lower the amount of available combustible air. This can affect the draft in the chimney and cause smoke spillage.
  • What are the installation requirements of a furnace?
    • It is recommended that there be at least 20ft of vertical chimney length.
    • The size of the flue needs to be the same size throughout the entire length of the installation.
    • No more than 180° in elbows. (This restricts draft)
    • For every 1ft of horizontal length there needs to be a ¼” rise.
    • Termination must include a UL approved rain cap.
    • All venting must be made by the same manufacturer.
      • Small variations between pipe manufacturers can lower efficiency of the chimney and pose a safety hazard!
    • After roof penetration: 3-2-10 rule must be followed.
      • There must be a minimum of 3 ft of piping past the point of penetration.
      • The termination must be 2 ft above anything within a 10 ft radius.
  • My furnace is able to burn coal. What types of coal should I use?
    Anthracite Coal (an-thruh-sight)
    • Harder coal that burns cleaner.
    • Much more difficult to use.
    • Not as available and much more expensive
    • SIZE: egg or broken egg (2 5/16” up to 4 3/8” in diameter).
    Bituminous Coal (bi-toom-uh-nus)
    • Softer coal that burns dirtier.
    • Requires more cleaning because more soot will collect on heating surfaces and pipes.
    • SIZE: large nut to small egg (1 3/4” to 4” Diameter).

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